package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexPatterns;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {


    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {


        //1.检验手机号合法性
        if (RegexUtils.isPhoneInvalid(phone)) {

            //2.不符合，返回错误信息
            return Result.fail("手机号码格式错误");
        }

        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

//        //4.保存到session
//        session.setAttribute("code",code);

          //4.保存到Redis中
          stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL,TimeUnit.MINUTES);

        //5.发生验证码
            //模拟手机短信收到验证吗
        log.debug("发送短信验证码成功，验证码：{}",code);
        //6.返回业务结果
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        //1.防止用户在填写的手机号与请求发送验证码的手机号不一致，需要重新验证手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误!");
        }

        //2.校验验证码@deprecated
        //        Object cacheCode = session.getAttribute("code");
        //2.从redis中获取验证码并校验
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)){
            ////3.不一致，报验证码错误
            return Result.fail("验证码错误");
        }

        //4.一致，根据用户手机号查询用户
        User user = query().eq("phone", phone).one();

        //5.判断是否存在该用户
        if (user == null){
            //6.不存在，创建新用户并保存数据库
            user = createUserWithPhone(phone);
        }

        //7.@deprecated 保存用户到Session
            //利用hutool工具类 把user中与userdto中对应相同的字段进行copy
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //7.保存用户信息到Redis中
            //7.1随机生成TOKEN，作为登录令牌
            String token = UUID.randomUUID().toString(true);
            //7.2将user对象转为Hash存储
            UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
            Map<String, Object> map = BeanUtil.beanToMap(userDTO,new HashMap<>(),CopyOptions.create()
                    .setIgnoreNullValue(true)
                    .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString())
            );
            //7.3存储并设置有效期 30min
            stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token,map);
            stringRedisTemplate.expire(LOGIN_USER_KEY + token,LOGIN_USER_TTL,TimeUnit.MINUTES);

        //8.返回Token
            return Result.ok(token);
    }

    @Override
    public Result sign() {

        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接Key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入Redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth - 1,true);
        return Result.ok();
    }

    private User createUserWithPhone(String phone) {

        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
